P17046: The Overcomer - Lower Extremity
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Systems Design

Table of Contents

Team Vision for System-Level Design Phase

During the systems design phase, in addition to accomplishing our goals from phase I and completing all of the assigned deliverables, we brainstormed different methods it would take to accomplish the necessary tasks to participate in typical recreational activities such as soccer and bowling and also how to attach OLE, Overcomer Lower-Extremity, to the wheelchair and walker. We were able to compare and contrast our current prototype to our concept development. This allowed us to see what areas could be improved. We are still pursuing our desired goal of improving the current design as well as moving the project from prototype to manufacturing. Paperwork for the Institutional Review Board approval to conduct testing is entering the final stages and we are collaborating with Overcomer Upper-Extremity team to conduct interviews and get some inputs on our current prototype.

Updated Phase I Documentation

Customer Requirements

Engineering Requirements

House of Quality

Functional Decomposition

Functional Decomposition

Functional Decomposition

Functional Decomposition

Benchmarking

Our project has no direct comparison within the target market and we therefore decided to instead benchmark a number of devices that serve a similar purpose to provide physical activity to either physically handicapped or rehabilitation patients.

Monark Rehab 871E PowerFit 3000 Resistance Gym 200 "Power Soccer" Guard
Weight (lbs) 55 37.5 7 UNK
Volume (ft^3) 2.5 29 3 UNK
Cost (USD) 1450 1680 350 330 + Brackets
Mounts to Wheelchair No Yes Yes Yes
Mechanical Assistance to User No No No No
Adjustable No Yes Yes No
Monark PowerFit Resistance Gym Power Soccer

Please note we have no affiliation with any of the above devices and all devices are property of their respective owners.

In addition to the above device benchmarking, we have also found some currently existing use cases: Adaptive Boccia and Power Soccer

In addition for comparison in our Pugh chart we used the customers existing solutions as a baseline model.

Bowling Attachment

Bowling Attachment

Clamping Attachment

Clamping Attachment

Soccer Attachment

Soccer Attachment

Morphological Chart

Morphological Chart

Morphological Chart

Morphological Chart

Concept Selection Criteria

  1. Safety (ANSI Compliance)
  2. Low Manufacturing and Development Cost
  3. Ease of Manufacturing
  4. Installation Time
  5. Power Requirements
  6. Ball Speed Generated
  7. Capture Radius
  8. Accuracy when Passing
  9. Use of Existing Parts
  10. Achievable within Time Allowed
Note
Not all "devices" used all criteria. For example, our selection of clamping devices did not factor in Ball Speed Generated or Capture Radius.

Concept Selection and Development

Sample Pugh Chart

Sample Pugh Chart

Bowling

Clamping

Soccer

Feasibility: Prototyping, Analysis, Simulation

Invalidation of Magnetism Concepts

Invalidation of Magnetism Concepts

Spring Calculations

Spring Calculations

Gear Calculations

Gear Calculations

Time Calculations

Time Calculations

Feasibility Analysis

Feasibility Concerns for Detailed Design

Systems Architecture

Systems Architecture

Systems Architecture

Systems Architecture

Designs and Flowcharts

Design Flowchart

Design Flowchart

Design Flowchart

Systems Level Design

Concept Sketches

Risk Assessment

Risk Management

Risk Management

Risk Management

Design Review Materials

Agenda and Supporting Documentation

Plans and Schedule for Phase III

 Phase III Schedule

Phase III Schedule


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